AirHint found the following cheapest return flights from Sydney (SYD) to Kathmandu (KTM) in December 2025 (see full year).

Return flights

30 Dec - 27 Jan	Qantas
01 Dec - 25 Dec	Thai Airways
01 Dec - 21 Dec	Thai Airways
02 Dec - 30 Dec	Cathay Pacific
05 Dec - 19 Dec	China Southern
05 Dec - 31 Dec	China Southern
01 Dec - 22 Dec	China Southern
08 Dec - 31 Dec	China Southern
08 Dec - 18 Dec	China Southern
03 Dec - 09 Dec	China Southern
14 Dec - 25 Dec	Cathay Pacific
02 Dec - 02 Jan	China Southern
05 Dec - 05 Jan	China Southern
04 Dec - 01 Jan	China Southern
01 Dec - 06 Jan	China Southern
08 Dec - 06 Jan	China Southern
01 Dec - 05 Jan	China Southern
04 Dec - 13 Jan	China Southern
28 Dec - 12 Jan	Cathay Pacific
24 Dec - 25 Jan	Cathay Pacific

Also check the deals for one-way flights from Sydney to Kathmandu in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Sydney to Kathmandu in December from 941€

Return flights